Roy Lake State Park is a South Dakota state park in Marshall County, South Dakota in the United States. The park is divided in two sections on Roy Lake, and is open for year-round recreation including camping, beaches, swimming, fishing, hiking and boating. The Roy Lake Resort & Lodge is located in the park. Boat ramps are available and visitors can rent boats from the resort.

There are 100 campsites on two campgrounds and 3 cabins.The name of Roy Lake recalls an incident when a dog named Roy drowned at the lake.

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